Gear ratio check

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 ==Overview==
 Methods to determine the gear ratio of the differential
+I just wanted to drop these links in somewhere they would be useful....
+http://www.quadratec.com/jeep_knowledgebase/article-26.htm
+http://www.alloyusa.com/gear-ratio-calculator/
 ==Codes==
@@ Line 45: / Line 49: @@
 ==Other methods==
-{{Note1}}The following methods require the drive tire diameter to be known. There are various places online that can estimate the tire diameter from the tire's size. This will be close enough.
+{{Note1}}The following methods require the drive tire diameter to be known. A table with some common tire sizes and diameters can be seen [[Gear ratio check#Tire size table|'''below''']]. There are also various places online that can estimate the tire diameter from the tire's size.
-Or, the tire can be measured by running a string around the tire, or marking the sidewall and floor, then move the car ahead one revolution and mark the ground a second time. Then simply measure the distance between the marks for the circumference. A [http://math.about.com/library/blcirclecalculator.htm calculator] can give a quick answer for the diameter. To find the diameter from the circumference long hand, use the formula: '''D equals C divided by Pi''', where '''D''' = diameter, '''C''' = circumference and '''Pi''' = 3.1416.
+Or, the tire can be measured by running a string around the tire and measuring its length, or marking the sidewall and floor, then move the car ahead one revolution and mark the ground a second time. Then simply measure the distance between the marks for the circumference. A  can give a quick answer for the diameter. To find the diameter from the circumference long hand, use the formula: '''D equals C divided by Pi''', where '''D''' = diameter, '''C''' = circumference and '''Pi''' = 3.1416.
-A table with some common tire sizes and diameters can be seen below.
 ===First method:===
@@ Line 72: / Line 74: @@
 ==Tire size table==
+Return to [[Gear ratio check#Other methods|'''above''']].
 <table class="techrows" style="font-size:10px" border="1" cellpadding="2" cellspacing="0" width="760"><tr valign="middle"><th class="titleb" rowspan="2">Approx. Tire Diameter<br>(in Inches)</th><th class="titlec" colspan="4" width="412"><strong>P-Metric and European Metric</strong></th><th class="titlec" colspan="4" width="412"><strong>LT-Metric</strong></th><th class="titled" colspan="2"><strong>Light Truck</strong></th></tr><tr valign="middle"><th class="titleb">82-series and 80-series</th><th class="titleb">75-series and 70-series</th><th class="titleb">65-series and 60-series</th><th class="titleb">55-series and lower<br></th><th class="titleb">85-series and 80-series</th><th class="titleb">75-series and 70-series</th><th class="titleb">65-series and 60-series</th><th class="titleb">55-series and lower<br></th><th class="titleb">Flotation</th><th class="title" style="font-size:10px">Numeric</th></tr><tr><td><strong>42</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>42x14.50R17LT</td><td><br></td></tr><tr class="grey"><td rowspan="3" width="103"><strong>40</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>40x13.50R20LT</td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>40x13.50R18LT</td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>40x13.50R17LT</td><td><br></td></tr><tr><td><strong>38-1/2</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>38.5x14.50R20LT</td><td><br></td></tr><tr class="grey"><td rowspan="4" width="103"><strong>38</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT395/70R16</td><td>LT395/65R18</td><td><br></td><td>38x14.00R24LT</td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>38x15.50R20LT</td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>38x15.50R18LT</td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>38x15.50R15LT</td><td><br></td></tr><tr><td rowspan="6" width="103"><strong>37</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT325/80R16</td><td><br></td><td><br></td><td><br></td><td>37x14.00R24LT</td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>37x13.50R22LT</td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>37x13.50R20LT</td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>37x13.50R18LT</td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>37x13.50R17LT</td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>37x12.50R17LT</td><td><br></td></tr><tr class="grey"><td rowspan="2" width="103"><strong>36</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT375/60R18</td><td><br></td><td>36x15.50R20LT</td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>36x15.50R15LT</td><td><br></td></tr><tr><td rowspan="2" width="103"><strong>35</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT305/70R18</td><td>LT285/65R20</td><td><br></td><td>35x13.50R20LT</td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT285/75R18</td><td>LT325/65R18</td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td rowspan="4" width="103"><strong>34-1/2</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT315/70R17</td><td>LT275/65R20</td><td><br></td><td>35X12.50R20LT</td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT315/75R16</td><td><br></td><td><br></td><td>35x12.50R18LT</td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>35x12.50R17LT</td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>35X12.50R15LT</td><td><br></td></tr><tr><td><strong>34</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT305/70R17</td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td><strong>33-1/2</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT255/85R16</td><td>LT275/70R18</td><td>LT285/60R20</td><td>LT305/55R20</td><td><br></td><td><br></td></tr><tr><td rowspan="4" width="103"><strong>33</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT285/70R17</td><td>LT325/60R18</td><td>LT325/50R20</td><td>33x12.50R20LT</td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT305/70R16</td><td>LT305/65R17</td><td>LT375/50R18</td><td>33x12.50R18LT</td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT285/75R16</td><td>LT295/65R18</td><td>LT375/55R16</td><td>33x12.50R17LT</td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>33x15.50R15LT</td><td><br></td></tr><tr class="grey"><td rowspan="3" width="103"><strong>32-1/2</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT275/70R17</td><td>LT305/60R18</td><td>LT375/55R16</td><td>33X12.50R16.5LT</td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT255/75R17</td><td>LT275/65R18</td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT315/70R15</td><td><br></td><td><br></td><td>33X12.50R15LT</td><td><br></td></tr><tr><td rowspan="3" width="103"><strong>32</strong></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT265/70R17</td><td><br></td><td>LT345/55R17</td><td><br></td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT245/75R17</td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT265/75R16</td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td rowspan="2" width="103"><strong>31-1/2</strong></td><td><br></td><td>265/70R17</td><td>285/60R18</td><td><br></td><td>LT235/85R16</td><td>LT265/75R16</td><td><br></td><td><br></td><td>32X11.50R15LT</td><td>7.50R16LT</td></tr><tr class="grey"><td><br></td><td>265/75R16</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td rowspan="2" width="103"><strong>31</strong></td><td><br></td><td>275/70R16</td><td><br></td><td>285/55R18</td><td>LT215/85R16</td><td>LT245/70R17</td><td><br></td><td>LT345/55R16</td><td><br></td><td><br></td></tr><tr><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>LT245/75R16</td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td rowspan="3" width="103"><strong>30-1/2</strong></td><td><br></td><td>265/70R16</td><td>285/60R17</td><td><br></td><td><br></td><td>LT285/70R15</td><td>LT325/60R15</td><td><br></td><td>31X10.50R16.5LT</td><td>9.50R16.5LT</td></tr><tr class="grey"><td><br></td><td>265/75R15</td><td>265/65R17</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>31X11.50R15LT</td><td><br></td></tr><tr class="grey"><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>31X10.50R15LT</td><td><br></td></tr><tr><td rowspan="2" width="103"><strong>30</strong></td><td><br></td><td>255/70R16</td><td>275/60R17</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td><br></td><td><br></td><td>255/65R17</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td rowspan="2" width="103"><strong>29-1/2</strong></td><td><br></td><td>245/70R16</td><td>265/60R17</td><td><br></td><td><br></td><td>LT225/75R16</td><td>LT285/60R16</td><td>LT315/55R16</td><td>30X9.50R15LT</td><td>8.75R16.5LT</td></tr><tr class="grey"><td><br></td><td>265/70R15</td><td>245/65R17</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td>7.00R15LT</td></tr><tr><td rowspan="3" width="103"><strong>29</strong></td><td>205R16</td><td>235/70R16</td><td>255/60R17</td><td>255/55R18</td><td><br></td><td>LT235/75R15</td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td>205/80R16</td><td>255/70R15</td><td>255/65R16</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td><br></td><td>235/75R15</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td rowspan="3" width="103"><strong>28-1/2</strong></td><td><br></td><td>225/70R16</td><td><br></td><td><br></td><td><br></td><td>LT225/75R15</td><td><br></td><td><br></td><td>29X9.50R15LT</td><td>8.00R16.5LT</td></tr><tr class="grey"><td><br></td><td>245/70R15</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td><br></td><td>225/75R15</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td><strong>28</strong></td><td><br>215/70R16</td><td>275/60R15</td><td>255/55R17</td><td><br></td><td><br></td><td>LT245/65R15</td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td rowspan="2" width="103"><strong>27-1/2</strong></td><td><br></td><td>225/70R15</td><td><br></td><td><br></td><td><br></td><td>LT215/75R15</td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td><br></td><td>215/75R15</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td rowspan="3" width="103"><strong>27</strong></td><td><br></td><td>205/75R15</td><td>255/60R15</td><td>255/50R17</td><td><br></td><td>LT205/75R15</td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td><br></td><td><br></td><td>225/60R16</td><td>305/50R15</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td><br></td><td><br></td><td>215/65R16</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td rowspan="2" width="103"><strong>26-1/2</strong></td><td><br></td> <td class="dark">225/70R14</td><td>245/60R15</td><td>295/50R15</td><td><br></td><td>LT195/75R15</td><td><br></td><td><br></td><td>27X8.50R14LT</td><td><br></td></tr><tr class="grey"><td><br></td><td>195/75R15</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td rowspan="3" width="103"><strong>26</strong></td><td>185R14</td><td>195/70R15</td><td>235/60R15</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td><br></td><td>215/70R14</td><td>215/65R15</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr><td><br></td><td>205/75R14</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td rowspan="2" width="103"><strong>25-1/2</strong></td><td><br></td><td>205/70R14</td><td>225/60R15</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr><tr class="grey"><td><br></td><td>195/75R14</td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td><td><br></td></tr></table>
 ==Resources==
@@ Line 78: / Line 82: @@
 [[Category:Identification and decoding]]
 [[Category:Rearend]]
-[[Category:Good articles]]

Gear ratio check

Latest revision as of 16:42, 8 December 2023

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